Ferrule for blasting cartridges



Oct. 13, 1931. w. A. MCCURDY 3 FERRULE FOR BLASTING CARTRIDGES Filed June 15. 1928 atented Got. 33, @931 FEBRULE FOR BLAS aaaaeaa WILLIAM A. MCGURDY, E DULUTH, MINNESOTA TING CARTRIDGES Application filed June 15, 1928. Serial No. 285,588.

This invention relates to a new and im-v proved blasting cartridge construction and more particularly to a ferrule adapted to be placed upon a blasting cartridge to maintain the firing cap in place in the cartridge.

In the use of cartridges for blasting they are commonly placed in a drilled hole in the material to be blasted after a cap has been insertedin the cartridge and firing means,

such as a fuse, or electric wires have been secured to the cap. The hole is then tamped with loose material to retain the cartridge in place and to properly direct the effect of the blast. In actual practice accidents have 13 occurred due to rock or other loose material falling on the priming cartridge and striking the cap so' that the same is exploded.

There is also thedifliculty. that sometimes, in

placing and tamping the cartridge, the cap is pulled from the cartridge by'the .fuse. or

wires. 7

It is an object of the present invention to provide a blasting means having means for securing the firing cap in place and protect- 7 ing the same. 1

This also an object to provide a construction of this characterin which the cap is held in place by a sleeve fastened upon the carvtridge.

It is an additional object to provide a sleeve which is cup-shaped in formation and adapted to be placed over an end of the cartridge. It is a further object to provide a construction which is simple in design and construction and adapted for commercial production. Other and further objects will appear as the description proceeds.

I have illustrated a preferred embodiment of my invention in the accompanying drawings, in which 1 Figure 1 is a side view struction;

Figure 2 is a similar view of a form of construction;'and

of one form of conmodified 4 1 Figure 3 is a section taken on line 3-3 of Figure 1. t

In the drawings, the cartridge has been designated 11 and in Figure 1 is provided with the tubular. sleeve 12. A cushion 13,

which may be formed of rubber, felt or asphaltum, is placed inside of the sleeve 12. The sleeve 12 is secured in'place by pins 14 which are forced into the/cartridge 11. These pins may be formed of wood or other material. The'firing cap 15 is shown inserted into the cartridge and the firing connections 16 lead from the cap past the end of the sleeve or'fuses.

In the form of construction shown in Figure 2 the cartridge 17 has the cup-shaped cap 18 slipped upon its end. The sleeve 18 is also provided witha cushioned lining 19 and is secured in place by the pins 20. The firing cap 21 is located in the end of the cartridge 17 and the firing connections 22 extend through an opening 23, formedin the end of the sleeve. Anend of the sleeve is also pro- 12. These connections may be electric wires vided with a cup-shaped'seat or socket 24 for receiving a charging stick 25 which may be used to seat the cartridge properly the blasting hole.

Either form of construction may be used and both adequately protect the cap against accidental discharge by material falling upon the cartridge. They also prevent it from being easily withdrawn from the cartridge.

The form of construction shown in Figure 2 has the additional advantage of protecting the end of the cartridge and forming a seat for use in forcing the cartridge'into the blast hole. The cushioning layers 13 and 19 are optional and may or may not be used. In some circumstances they may prove desirable.

While I have. shown certain preferred forms of my-invention by way of example, it is capable of further modification to meet varying conditions of use, and I contemplate such changes and modifications as come within the spirit and scope of the appended claim.

I claim:

A blasting article comprising, in combination, a cartridge a hollow member mounted 1 upon the cartridge and adapted to hold in proper position the detonating cap, and a cushion inserted between the hollow member and the blasting cartridge.

Signed at Virginia, Minnesota, this seventh day of June, 1928.

' WHJLIAM A. MCCURDY. 

